Reverse X & Y axis

Posted 26 December 2012 - 04:17 PM

Hey, I'm making a program to show the coordinates wherever the mousecursor is. That part is done.
But right now the coordinates is showing from top to bottom. It starts at 0 at the left top corner, and gets higher when I move the cursor away from it. Is there anyway to reverse this so it starts from the left corner and the number goes down when I move the cursor from it?